Vicious Skewering has this impale effect on bleeding hit.
So, the higher the bleed chance the stronger the impale effect.
For example,
15% impale effect on a 50% bleed chance will be 7.5%.
100% bleed chance will be a full 15% impale effect.
However, once you reach 100% bleed chance, you can still get DPS increased by getting more %bleed chance.
The DPS calculation become:
150% bleed chance = 22.5% impale effect.
200% bleed chance = 30% impale effect.
I don't think this is correct.